--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/tests/ima_adpcm_tests.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,218 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * ima_adpcm_tests.c - Test the IMA/DVI/Intel ADPCM encode and decode
+ *                     software.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2004 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: ima_adpcm_tests.c,v 1.36 2009/05/30 15:23:14 steveu Exp $
+ */
+
+/*! \file */
+
+/*! \page ima_adpcm_tests_page IMA ADPCM tests
+\section ima_adpcm_tests_page_sec_1 What does it do?
+To perform a general audio quality test, ima_adpcm_tests should be run. The test file
+../test-data/local/short_nb_voice.wav will be compressed to the specified bit rate,
+decompressed, and the resulting audio stored in post_ima_adpcm.wav. A simple SNR test
+is automatically performed. Listening tests may be used for a more detailed evaluation
+of the degradation in quality caused by the compression.
+
+\section ima_adpcm_tests_page_sec_2 How is it used?
+*/
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <sndfile.h>
+
+//#if defined(WITH_SPANDSP_INTERNALS)
+#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
+//#endif
+
+#include "spandsp.h"
+#include "spandsp-sim.h"
+
+#define IN_FILE_NAME    "../test-data/local/short_nb_voice.wav"
+#define OUT_FILE_NAME   "post_ima_adpcm.wav"
+
+#define HIST_LEN        2000
+
+int main(int argc, char *argv[])
+{
+    int i;
+    SNDFILE *inhandle;
+    SNDFILE *outhandle;
+    int frames;
+    int dec_frames;
+    int outframes;
+    int ima_bytes;
+    double pre_energy;
+    double post_energy;
+    double diff_energy;
+    int16_t pre_amp[HIST_LEN];
+    int16_t post_amp[HIST_LEN];
+    uint8_t ima_data[HIST_LEN];
+    int16_t history[HIST_LEN];
+    int hist_in;
+    int hist_out;
+    ima_adpcm_state_t *ima_enc_state;
+    ima_adpcm_state_t *ima_dec_state;
+    int xx;
+    int total_pre_samples;
+    int total_compressed_bytes;
+    int total_post_samples;
+    const char *in_file_name;
+    int variant;
+    int chunk_size;
+    int enc_chunk_size;
+    int log_encoded_data;
+    int opt;
+
+    variant = IMA_ADPCM_DVI4;
+    in_file_name = IN_FILE_NAME;
+    chunk_size = 160;
+    enc_chunk_size = 0;
+    log_encoded_data = FALSE;
+    while ((opt = getopt(argc, argv, "ac:i:lv")) != -1)
+    {
+        switch (opt)
+        {
+        case 'a':
+            variant = IMA_ADPCM_IMA4;
+            chunk_size = 505;
+            break;
+        case 'c':
+            enc_chunk_size = atoi(optarg);
+            break;
+        case 'i':
+            in_file_name = optarg;
+            break;
+        case 'l':
+            log_encoded_data = TRUE;
+            break;
+        case 'v':
+            variant = IMA_ADPCM_VDVI;
+            break;
+        default:
+            //usage();
+            exit(2);
+            break;
+        }
+    }
+
+    if ((inhandle = sf_open_telephony_read(in_file_name, 1)) == NULL)
+    {
+        fprintf(stderr, "    Cannot open audio file '%s'\n", in_file_name);
+        exit(2);
+    }
+
+    if ((outhandle = sf_open_telephony_write(OUT_FILE_NAME, 1)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_NAME);
+        exit(2);
+    }
+
+    if ((ima_enc_state = ima_adpcm_init(NULL, variant, enc_chunk_size)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create encoder\n");
+        exit(2);
+    }
+        
+    if ((ima_dec_state = ima_adpcm_init(NULL, variant, enc_chunk_size)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create decoder\n");
+        exit(2);
+    }
+
+    hist_in = 0;
+    hist_out = 0;
+    pre_energy = 0.0;
+    post_energy = 0.0;
+    diff_energy = 0.0;
+    total_pre_samples = 0;
+    total_compressed_bytes = 0;
+    total_post_samples = 0;
+    while ((frames = sf_readf_short(inhandle, pre_amp, chunk_size)))
+    {
+        total_pre_samples += frames;
+        ima_bytes = ima_adpcm_encode(ima_enc_state, ima_data, pre_amp, frames);
+        if (log_encoded_data)
+            write(1, ima_data, ima_bytes);
+        total_compressed_bytes += ima_bytes;
+        dec_frames = ima_adpcm_decode(ima_dec_state, post_amp, ima_data, ima_bytes);
+        total_post_samples += dec_frames;
+        for (i = 0;  i < frames;  i++)
+        {
+            history[hist_in++] = pre_amp[i];
+            if (hist_in >= HIST_LEN)
+                hist_in = 0;
+            pre_energy += (double) pre_amp[i] * (double) pre_amp[i];
+        }
+        for (i = 0;  i < dec_frames;  i++)
+        {
+            post_energy += (double) post_amp[i] * (double) post_amp[i];
+            xx = post_amp[i] - history[hist_out++];
+            if (hist_out >= HIST_LEN)
+                hist_out = 0;
+            diff_energy += (double) xx * (double) xx;
+        }
+        outframes = sf_writef_short(outhandle, post_amp, dec_frames);
+    }
+    if (sf_close(inhandle) != 0)
+    {
+        fprintf(stderr, "    Cannot close audio file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if (sf_close(outhandle) != 0)
+    {
+        fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_NAME);
+        exit(2);
+    }
+    ima_adpcm_release(ima_enc_state);
+    ima_adpcm_release(ima_dec_state);
+
+    printf("Pre samples: %d\n", total_pre_samples);
+    printf("Compressed bytes: %d\n", total_compressed_bytes);
+    printf("Post samples: %d\n", total_post_samples);
+
+    printf("Output energy is %f%% of input energy.\n", 100.0*post_energy/pre_energy);
+    printf("Residual energy is %f%% of the total.\n", 100.0*diff_energy/post_energy);
+    if (fabs(1.0 - post_energy/pre_energy) > 0.05
+        ||
+        fabs(diff_energy/post_energy) > 0.03)
+    {
+        printf("Tests failed.\n");
+        exit(2);
+    }
+    
+    printf("Tests passed.\n");
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/